排水系统
a network of pipes, ditches, or channels to remove water
用于排水的管道、沟渠或通道网络
排水管
a pipe used to carry away water or waste
用于排走水或废物的管道
a long narrow trench dug to drain water
排水通道
a natural or artificial channel for carrying away water
用于排水的天然或人工通道
a man-made channel constructed to drain water from an area
排水孔
an opening to allow water or other liquids to pass out
让水排走的孔